4.When does a person get sunstroke?

　　A.When the body doesn't function.

　　B.When proper care is given immediately.

　　C.When someone is exposed to the sun too long.

　　D.When the body temperature goes up beyond what one can bear.

　　5.Which of the following is NOT mentioned in the text?

　　A.Call for assistance from others.

　　B.Leave the sunstroke person in the shade.

　　C.Put a wet towel on the person's face.

　　D.Help the person take some medicine.

　　6.What is mainly discussed in the passage?

　　A.The first aid for sunstroke.

　　B.The causes of sunstroke.

　　C.The chief symptoms of sunstroke.

　　D.The essential prevention of sunstroke.

　　7.The text probably comes from

　　a (n) ________.

　　A.guidebook　 B.book review

　　C.medical magazine

　　D.official document

　　C

　　Reading keeps your brain young.

　　Digging into a

　　good book can literally take years off your mind, according to a recent study from Rush University Medical Center. Adults who spend their free time doing creative activities (like reading) have a 32 percent slower rate of cognitive (认知的) decline later in life than those who do not. “Brainy pursuits make the brain more efficient by changing its structure to continue functioning properly，” said Robert S.Wilson, a professor at Rush University Medical Center. Another recent study found that older adults who regularly read are two and a half times less likely to develop mental diseases.

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